CN110762804B - Outer fan rotating speed control method of variable frequency air conditioner and variable frequency air conditioner - Google Patents
Outer fan rotating speed control method of variable frequency air conditioner and variable frequency air conditioner Download PDFInfo
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- CN110762804B CN110762804B CN201810842534.7A CN201810842534A CN110762804B CN 110762804 B CN110762804 B CN 110762804B CN 201810842534 A CN201810842534 A CN 201810842534A CN 110762804 B CN110762804 B CN 110762804B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention provides an external fan rotating speed control method of a variable frequency air conditioner and the variable frequency air conditioner, wherein the control method comprises the following steps: s10, acquiring the current superheat degree of the variable frequency air conditioner; s20, judging whether the current superheat degree is larger than or equal to a preset target superheat degree, and if so, executing S30; s30, controlling the outer fan of the variable frequency air conditioner to periodically switch between a first rotating speed and a second rotating speed; s40, monitoring the relay temperature of the outer fan; s50, judging whether the relay temperature is larger than or equal to a preset temperature threshold, if so, executing S60, and otherwise, executing S30; and S60, controlling the outer fan to operate at the first rotating speed, and continuously monitoring the temperature of the relay. According to the invention, the external fan is controlled to periodically switch between the first rotating speed and the second rotating speed, so that the power is saved on the premise of not reducing the performance of the air conditioner, and the service life of the relay is ensured by monitoring the temperature of the relay.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an external fan rotating speed control method of a variable frequency air conditioner and the variable frequency air conditioner adopting the control method.
Background
Under the great trend of reducing cost of an air conditioning system, the variable frequency air conditioner basically adopts capillary tube throttling to replace the throttling of an original electronic expansion valve, an internal fan and an external fan also basically adopt a single direct current or double alternating current mode to reduce cost, and most of the current single direct current schemes adopt a configuration scheme of direct current of the internal fan and alternating current of the external fan, so that the method for adjusting the variable frequency air conditioner is less and less for system development and debugging personnel.
However, the conventional debugging means reduces the cooling (or heating) performance while reducing the air conditioning power, so that the final energy efficiency ratio is not greatly changed. For example, the conventional debugging means for the intermediate refrigeration condition, the variable capillary tube or the variable charge capacity is restricted by other conditions, if the frequency reduction means is adopted, the refrigeration performance and the power are basically reduced at the same time after frequency reduction, and the reduction amplitude is equivalent, so that the final energy efficiency is not greatly changed.
Therefore, a control scheme is required to be found to ensure that the performance of the air conditioner is kept unchanged while the power is reduced, so that the energy efficiency ratio of the air conditioner can be effectively improved.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present invention and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an external fan rotating speed control method of a variable frequency air conditioner and the variable frequency air conditioner, which can solve the problems that the performance of the air conditioner is reduced and the energy efficiency ratio of the air conditioner cannot be improved when the power is reduced.
According to one aspect of the invention, a method for controlling the rotating speed of an external fan of a variable frequency air conditioner is provided, which comprises the following steps: s10, acquiring the current superheat degree of the variable frequency air conditioner; s20, judging whether the current superheat degree is larger than or equal to a preset target superheat degree, and if so, executing S30; s30, controlling the outer fan of the variable frequency air conditioner to periodically switch between a first rotating speed and a second rotating speed; s40, monitoring the relay temperature of the outer fan; s50, judging whether the relay temperature is larger than or equal to a preset temperature threshold, if so, executing S60, and otherwise, executing S30; and S60, controlling the outer fan to operate at the first rotating speed, and continuously monitoring the temperature of the relay.
Preferably, the method for controlling the rotational speed of the external fan further includes: s70, judging whether the periodic switching operation duration time of the outer fan reaches a preset time threshold, if so, executing S80, and if not, executing S30; and S80, finishing the periodic switching operation, and controlling the outer fan to operate at the first rotating speed.
Preferably, in the above method for controlling the rotational speed of the external air blower, the step S30 includes: s310, controlling the outer fan to operate at the second rotating speed; s320, judging whether the operation of the outer fan at the second rotating speed reaches a first duration time, if so, executing S330; s330, controlling the outer fan to operate at the first rotating speed; and S340, judging whether the operation of the outer fan at the first rotating speed reaches a second duration time, and if so, returning to S310.
Preferably, in the method for controlling the rotational speed of the external fan, the first rotational speed is a fixed rotational speed, the second rotational speed is an interval rotational speed, and the second rotational speed is less than or equal to the first rotational speed.
Preferably, in the method for controlling the rotational speed of the external fan, the first duration is 0.3s, and the second duration is 1 s.
Preferably, in the method for controlling the rotational speed of the external fan, the external fan is controlled to operate at the second rotational speed by a relay power-off operation of the external fan, and the external fan is controlled to operate at the first rotational speed by a relay power-on operation of the external fan.
Preferably, in the method for controlling the rotational speed of the external fan, the external fan is controlled to operate at the second rotational speed by a preset first speed regulation instruction, and the external fan is controlled to operate at the first rotational speed by a preset second speed regulation instruction.
Preferably, in the method for controlling the rotating speed of the external fan, the variable frequency air conditioner comprises a refrigeration working condition and a heating working condition; under the refrigerating working condition, the current superheat degree is obtained through the difference value between the compression air suction temperature of the variable frequency air conditioner and the temperature of an indoor unit coil; under the heating condition, the current superheat degree is obtained by the difference between the compression suction temperature of the variable frequency air conditioner and the temperature of an outer unit coil.
Preferably, in the above method for controlling the rotational speed of the external fan, the superheat degree of the inverter air conditioner is measured under an intermediate refrigeration condition, and is used as the target superheat degree under the refrigeration condition; and measuring the superheat degree of the variable frequency air conditioner under the intermediate heating working condition to be used as the target superheat degree under the heating working condition.
According to another aspect of the invention, a variable frequency air conditioner is provided, wherein the variable frequency air conditioner adopts the method for controlling the rotating speed of the outer fan to control the rotating speed of the outer fan; the current superheat degree of the variable frequency air conditioner is obtained and monitored by adopting a first temperature sensor, and the relay temperature of the outer fan is obtained and monitored by adopting a second temperature sensor.
Compared with the prior art, the invention has the beneficial effects that:
the method monitors the superheat degree of the variable frequency air conditioner, and controls the outer fan to periodically switch between the first rotating speed and the second rotating speed when the superheat degree reaches a certain amplitude value, so that the performance is ensured to be unchanged while the power of the air conditioner is reduced, and the energy efficiency ratio of the variable frequency air conditioner is effectively improved;
meanwhile, the temperature of the relay of the outer fan is monitored, and the service life of the relay is ensured.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a flow chart illustrating a method for controlling the rotational speed of an external fan according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for controlling the rotational speed of an external fan according to another embodiment of the present invention;
fig. 3 is a flow chart illustrating a periodic switching operation of the external fan according to an embodiment of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
Fig. 1 is a flow chart illustrating a method for controlling the rotational speed of an external fan according to an embodiment of the present invention. Referring to fig. 1, the method for controlling the rotation speed of the external fan in the embodiment includes:
and step S10, acquiring the current superheat degree of the variable frequency air conditioner.
Specifically, under the refrigeration condition, the superheat degree is the difference between the compression suction temperature and the temperature of the coil of the internal machine. That is, under the refrigeration condition, the current superheat degree of the variable frequency air conditioner is obtained by the difference value between the compression suction temperature of the variable frequency air conditioner and the temperature of the coil pipe of the internal unit. Under the heating condition, the superheat degree is the difference value between the compression suction temperature and the temperature of the outer machine coil. That is, under the heating working condition, the current superheat degree of the inverter air conditioner is obtained by the difference between the compression air suction temperature of the inverter air conditioner and the temperature of the outer unit coil.
Step S20, judging whether the current superheat degree is larger than or equal to a preset target superheat degree, if so, executing S30; and S30, controlling the outer fan of the variable frequency air conditioner to periodically switch between the first rotating speed and the second rotating speed.
In a preferred embodiment, the superheat degree of the variable frequency air conditioner is measured under the intermediate refrigeration working condition and is used as the target superheat degree under the refrigeration working condition. And measuring the superheat degree of the variable frequency air conditioner under the intermediate heating working condition to be used as the target superheat degree under the heating working condition. When the variable frequency air conditioner enters a test mode and the superheat degree reaches a target superheat degree, the external fan can be periodically switched to operate to reduce the power consumption in order to further reduce the system power consumption.
In order to stabilize the operation of the air conditioner, in a preferred embodiment, after the superheat degree of the inverter air conditioner reaches the target superheat degree and is maintained for a stable time period, the external fan is controlled to periodically switch to operate, so as to stabilize the performance of the inverter air conditioner. The stabilization period is, for example, from 0.5h to 1 h.
The self-balancing effect of the variable frequency air conditioner can be improved and the measurement precision is improved by monitoring the superheat degree as a judgment reference for adjusting the rotating speed of the outer fan of the variable frequency air conditioner. In addition, the air conditioner is easy to have refrigerant leakage during operation, and even slight refrigerant leakage can cause many operation parameters of the air conditioner, such as unstable exhaust temperature and inaccurate measurement; this application is through monitoring the superheat degree to with superheat degree and target superheat degree comparison calculation difference, judge through two point measurements twice, reduce the influence that single measuring error brought, promote the precision, realize the outer fan rotational speed of accurate control.
Further, referring to fig. 3, the step of controlling the periodic switching operation of the external air blower specifically includes: s310, controlling the outer fan to operate at a second rotating speed; s320, judging whether the operation of the outer fan at the second rotating speed reaches a first duration time, if so, executing S330; s330, controlling the outer fan to run at a first rotating speed; and S340, judging whether the operation of the outer fan at the first rotating speed reaches a second duration time, and if so, returning to S310.
The first rotating speed is a fixed rotating speed, the second rotating speed is an interval rotating speed, and the second rotating speed is less than or equal to the first rotating speed. The first duration is 0.3s and the second duration is 1 s.
Particularly, when the outer fan is an alternating current fan, the outer fan is controlled to run at a second rotating speed through the relay power-off operation of the outer fan, and the outer fan is controlled to run at a first rotating speed through the relay power-on operation of the outer fan. When the outer fan is a direct current fan, the outer fan is controlled to operate at a second rotating speed through a preset first speed regulating instruction, and the outer fan is controlled to operate at the first rotating speed through a preset second speed regulating instruction.
In a practical application scenario, the external fan is an ac fan as an example. When the superheat degree of the variable frequency air conditioner reaches the target superheat degree and is maintained for a stable time period, the variable frequency air conditioner is indicated to enter a stable operation state, and an external fan of the variable frequency air conditioner can be controlled to periodically switch to operate. The original running speed of an outer fan of the variable frequency air conditioner is a first rotating speed, and the relay is electrified at the moment, so that the outer fan runs at the first rotating speed and the uniform speed. When the periodic switching operation is started, the relay is powered off, and the outer fan does not enjoy the operation driving force from the relay any more. But thanks to the inertia effect, the external fan can still keep the original first rotating speed to operate for a short time after the relay is powered off. The inventors found that the outer fan can keep operating at the original speed or operate at a slightly lower speed than the original speed due to inertia within 0.3 seconds after the relay is de-energized. The operation speed of the relay which depends on inertia after power failure is recorded as a second rotation speed, the second rotation speed is not limited to a fixed value, but can be a speed interval, and any value of the speed interval is smaller than or equal to the first rotation speed. Furthermore, when the relay is powered off (namely the outer fan runs at the second rotating speed) for the first duration, in order to avoid the performance reduction of the air conditioner caused by too much reduction of the speed of the outer fan, the relay is controlled to be powered on, so that the outer fan can recover to run at the first rotating speed. The first duration time is less than or equal to 0.3s, the preferable value is 0.1 s-0.3 s, and the more preferable value is 0.3s, so that the rotating speed of the outer fan is reduced at least after the relay is powered off, the refrigerating (heating) performance of the air conditioner is kept basically unchanged, the power consumption in the period is zero, the performance of the air conditioner is kept unchanged, the power consumption is reduced, and the energy efficiency ratio is improved. And continuing to operate at the first rotating speed (namely, the relay is electrified) for a second duration time, the outer fan obtains a sufficiently stable rotating speed, and then the relay is controlled to be powered off, so that the outer fan operates at the second rotating speed by means of inertia. The second duration is preferably 1 s.
According to the control method, the outer fan is controlled to periodically switch to operate, when the outer fan is switched to the second rotating speed, the power consumption of the outer fan is reduced but the air-conditioning performance is unchanged, and when the outer fan is switched to the first rotating speed, the outer fan obtains enough driving force so as to continuously switch to the second rotating speed after the preset time, so that the power consumption is saved and the cooling (heating) performance is kept.
And for the direct current fan, the external fan is controlled to periodically switch and operate through a preset instruction. For example, the operating speed of the external fan is controlled to be switched to a second rotating speed through a low rotating speed instruction, wherein the second rotating speed is slightly smaller than the original speed or even half of the original speed; and after 0.3s, controlling the running speed of the outer fan to be switched to the original speed, namely the first rotating speed, through a high rotating speed instruction. And after 1s, controlling the outer fan to switch to a second rotating speed through a low rotating speed instruction, and circulating in the way.
Further, referring to fig. 1, the method for controlling the rotational speed of the external fan further includes:
s40, monitoring the relay temperature of the outer fan; s50, judging whether the relay temperature is larger than or equal to a preset temperature threshold value; if so, executing S60, otherwise, executing S30 (controlling the outer fan to periodically switch between the first rotating speed and the second rotating speed); and S60, controlling the outer fan to operate at the first rotating speed, and continuously monitoring the temperature of the relay.
Still take the ac fan as an example. Because the temperature rises after the relay is powered on and off for a period of time, there is a risk of damage. Therefore, the temperature of the relay is monitored, if the temperature of the relay is too high, a protection mode is started for the relay, namely, the relay is not powered off and electrified to control the periodic switching operation of the outer fan, so that the relay is kept in an electrified state, and the outer fan continuously operates at a first rotating speed. Meanwhile, the temperature of the relay is continuously monitored, and when the temperature of the relay is reduced to be smaller than a preset temperature threshold value, the relay is powered off and powered on to control the outer fan to switch periodically. And preferably, the temperature of the relay is kept for a stable time period after being reduced to be less than a preset temperature threshold value, so that the safety of the relay is ensured. The preset temperature threshold may be set according to process parameters, for example, 35 ℃.
By monitoring the temperature of the relay, the relay is not damaged due to frequent power-off and power-on operations, and the service life of the relay is ensured.
In a preferred embodiment, the method for controlling the rotational speed of the external fan further comprises:
s70, judging whether the duration time of the periodic switching operation of the outer fan reaches a preset time threshold, if so, executing S80, and if not, executing S30 (controlling the periodic switching operation of the outer fan between the first rotating speed and the second rotating speed); and S80, finishing the periodic switching operation and controlling the outer fan to operate at the first rotating speed.
When the external fan is periodically switched to operate for a continuous time threshold under the power-off and power-on operation of the relay, for example, the external fan is periodically switched to operate for more than ten hours, the periodic switching operation of the external fan is ended no matter whether the temperature of the relay exceeds the temperature threshold, the relay is kept powered on to protect the relay, and the external fan recovers to operate at the first rotating speed and the uniform speed.
Through the method for controlling the rotating speed of the external fan, the energy efficiency of the whole Performance of the variable frequency air conditioner is improved by 1.67% under the intermediate refrigeration working condition of the measurement and control mode, and the method is helpful for improving the whole Performance of an APF (Annual Performance Factor).
Specific experimental data are shown in table one (before improvement) and table two (after improvement):
table one (before improvement):
table two (after improvement):
the embodiment of the invention also provides a variable frequency air conditioner which adopts the control method described in any embodiment to control the rotating speed of the external fan; the current superheat degree of the variable frequency air conditioner is obtained and monitored by the aid of the first temperature sensor, and the relay temperature of the outer fan is obtained and monitored by the aid of the second temperature sensor. The control principle refers to the above embodiments, and is not described in detail.
In summary, the method for controlling the rotating speed of the external fan of the inverter air conditioner and the inverter air conditioner of the present invention have at least the following advantages:
by monitoring the superheat degree of the variable frequency air conditioner, when the superheat degree reaches a certain amplitude, the outer fan is controlled to periodically switch between a first rotating speed and a second rotating speed, and the switching time is controlled, so that the refrigeration (heating) performance is ensured to be unchanged while the air conditioner power is reduced, and the energy efficiency ratio of the variable frequency air conditioner is effectively improved;
meanwhile, the monitoring superheat degree is used as a judgment reference for adjusting the rotating speed of an outer fan of the variable frequency air conditioner, so that the self-balancing effect of the variable frequency air conditioner is improved, the measurement precision is improved, and the rotating speed of the outer fan is accurately controlled;
in addition, the relay temperature of the outer fan is monitored, so that the relay cannot be damaged due to overhigh temperature, and the stable performance of the variable frequency air conditioner is ensured.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. A method for controlling the rotating speed of an external fan of a variable frequency air conditioner is characterized by comprising the following steps:
s10, acquiring the current superheat degree of the variable frequency air conditioner;
s20, judging whether the current superheat degree is larger than or equal to a preset target superheat degree, and if so, executing S30;
s30, controlling the outer fan of the variable frequency air conditioner to periodically switch between a first rotating speed and a second rotating speed, and comprising the following steps: controlling the outer fan to operate at the second rotating speed through the relay power-off operation of the outer fan, and controlling the outer fan to operate at the first rotating speed through the relay power-on operation of the outer fan;
s40, monitoring the relay temperature of the outer fan;
s50, judging whether the relay temperature is larger than or equal to a preset temperature threshold, if so, executing S60, and otherwise, executing S30;
and S60, controlling the outer fan to operate at the first rotating speed, and continuously monitoring the temperature of the relay.
2. The external fan rotational speed control method according to claim 1, further comprising:
s70, judging whether the periodic switching operation duration time of the outer fan reaches a preset time threshold, if so, executing S80 no matter whether the temperature of the relay exceeds the temperature threshold, and if not, executing S30;
and S80, finishing the periodic switching operation, and controlling the outer fan to operate at the first rotating speed.
3. The external fan rotational speed control method according to claim 1, wherein the step S30 includes:
s310, controlling the outer fan to operate at the second rotating speed;
s320, judging whether the operation of the outer fan at the second rotating speed reaches a first duration time, if so, executing S330;
s330, controlling the outer fan to operate at the first rotating speed; and
and S340, judging whether the operation of the outer fan at the first rotating speed reaches a second duration time, and if so, returning to S310.
4. The method of claim 3, wherein the first speed is a fixed speed, the second speed is an interval speed, and the second speed is less than or equal to the first speed.
5. The external fan speed control method according to claim 3, wherein the first duration is 0.3s and the second duration is 1 s.
6. The method for controlling the rotating speed of the external fan according to claim 1, wherein the inverter air conditioner comprises a cooling working condition and a heating working condition;
under the refrigerating working condition, the current superheat degree is obtained through the difference value between the compression air suction temperature of the variable frequency air conditioner and the temperature of an indoor unit coil;
under the heating condition, the current superheat degree is obtained by the difference between the compression suction temperature of the variable frequency air conditioner and the temperature of an outer unit coil.
7. The external fan rotational speed control method according to claim 6, characterized in that:
measuring the superheat degree of the variable frequency air conditioner under the intermediate refrigeration working condition to be used as the target superheat degree under the refrigeration working condition;
and measuring the superheat degree of the variable frequency air conditioner under the intermediate heating working condition to be used as the target superheat degree under the heating working condition.
8. An inverter air conditioner, characterized in that the inverter air conditioner adopts the method for controlling the rotating speed of the external fan according to any one of claims 1 to 7;
the current superheat degree of the variable frequency air conditioner is obtained and monitored by adopting a first temperature sensor, and the relay temperature of the outer fan is obtained and monitored by adopting a second temperature sensor.
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| CN105650812A (en) * | 2016-01-04 | 2016-06-08 | 广东美的暖通设备有限公司 | Control method for indoor fan of air conditioner and air conditioner |
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| JPH0498040A (en) * | 1990-08-10 | 1992-03-30 | Daikin Ind Ltd | Operation control device for air conditioner |
| JP2000055444A (en) * | 1998-08-07 | 2000-02-25 | Ntt Power & Building Facilities Inc | Air conditioner |
| JP2014228226A (en) * | 2013-05-24 | 2014-12-08 | パナソニック株式会社 | Heat pump air conditioner |
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